png格式的图片如何相加
Cximage类的函数
void DlgMix::SetMix()
{
pDocSrc = (CDemoDoc*) m_cbSrc.GetItemData(m_cbSrc.GetCurSel());
pDocDst = (CDemoDoc*) m_cbDst.GetItemData(m_cbDst.GetCurSel());
OpType = m_cbOpType.GetItemData(m_cbOpType.GetCurSel());

if (pDocSrc==0 || pDocDst==0) return;

CxImage* pImageSrc = pDocSrc->GetImage();
CxImage* pImageDst = pDocDst->GetImage();

SetThumbs(pImageSrc,pImageDst);

CxImage tmp;
tmp.Copy(m_imageDst);
tmp.Mix(m_imageSrc,(CxImage::ImageOpType)OpType,(long)(m_xoffset*m_ratio),(long)(m_yoffset*m_ratio),m_mixalpha!=0);

if (m_mixalpha!=0){
RGBQUAD c={255,255,255,0};
tmp.SetTransColor(c);
tmp.AlphaStrip();
}

if (m_bitmap) DeleteObject(m_bitmap);
m_bitmap = tmp.MakeBitmap(m_picture.GetDC()->m_hDC);
m_picture.SetBitmap(m_bitmap);
}
我是想直接从文件的路径名把两个图像（格式为png）相加，例如有这么个相加的函数Add（CString file1，CString file2）；应该如何改写红色部分的Mix函数啊？

[解决办法]
void CxImage::Mix ( CxImage & imgsrc2,
ImageOpType op,
int32_t lXOffset = 0,
int32_t lYOffset = 0,
bool bMixAlpha = false
)
Parameters:
imgsrc2,: image to be mixed with this
op,: blending method; see ImageOpType
lXOffset,lYOffset,: image displacement
bMixAlpha,: if true and imgsrc2 has a valid alpha layer, it will be mixed in the destination image.


[解决办法]
为什么不读进opencv，然后出来，做运算还是很简单的
[解决办法]
还没解决呢